If it's not what You are looking for type in the equation solver your own equation and let us solve it.
y in (-oo:+oo)
y/8-2.1 = -14.9 // + 14.9
y/8-2.1+14.9 = 0
1/8*y+12.8 = 0 // - 12.8
1/8*y = -12.8 // : 1/8
y = -12.8/1/8
y = -102.4
y = -102.4
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